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If you killed the fungus it's good enough. It won't grow or do any further damage. I bought a lot of lenses off eBay and made sure that there was always an explicit mention of no fungus in the listing. There's a lot of reading available about this topic on the Pentax Forums and how to store those lenses. Fungus is a one way road unfortunately. If it's there the damage is already done. Having said that you'd need a lot of contamination to significantly deteriorate the image through the lens. You'll have a bit of light scattering, that's all. Nothing dramatic. It's not a show stopper. It's like surface scratches on the optics.
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